Guys
The essential guide to the Gammons is called "A Walking Guide to the Northern Flinders Ranges" by Adrian Heard.
You really must have good maps - and personally, I would not do too much without the guide.
You are probably aware of the 2 circuits I have posted on. In both cases we had 2 wheel drive and did not attempt car access to Grindalls or Loch Ness Well.
Our basic stats for comparison
Trip 1: Carrying 8 litres of water each - 23Kg + packs to start.
Day 1: Drive to Weetootla Gorge car park [near Balcanoona Park HQ] - walk through gorge to Grindalls Hut - 6.5 km in 1.5 hrs. Water available in the hikers hut rainwater tank.
Day 2: Walk road to Loch Ness Well, then up Bunyip Creek to Bunyip Chasm. Water in small waterholes along this route. Climb Steadmans Ridge from Chasm turnoff and camp on ridgetop about 1km in from Mt John Roberts [visited Mt John Roberts late afternoon] 12.2km, 700m climb in 6.5 hrs
Day 3: Up Steadmans to descent point into Shelf Chasm and through to Italowie North and Wildflower Creek. Accidentally ascended part of Cleft and kept going up NW ridge to camp at the top. 10.4km, 470m in 7.5 hrs
Day 4: Descend Cleft by NW ridge to Rover Rockhole [top up water] - explore up Terraces to Fern Chasm and return via Wildflower Ck to Iltalowie 10.9km, 300m in 6:10hrs
Day 5: Return to Grindalls via Gibber Plain and back through Weetootla to car. 14km and 90m climb in 4 hrs
Weather assisted by being reasonably cool, but biggest issue was trying to walk fast in the very bouldery creek beds.
Trip 2: Heavy packs again
Day 1: Drive to Italowie Gorge and park on side road up the Italowie Creek arm. Walk up Doctor Chewings Creek to entrance to McKinley Basin. 7.5km, 190m in 2.5 hrs.
Day 2: Climb up the face ridge of Mt McKinley [this is 'adventurous', but well worth it]. 3km, 585m in 4:45 hrs. Camped at top.
Day 3: Descend to Breaking Wave - carefully pick the ridge to Pine Saddle, then scrub bash to top of Octopus Hill. Follow north ridge down to Junction Creek, but look for a pad along an exit drop on the LHS just before a final drop off the ridge. We almost came to grief trying to work directly down this ridge end as it broke away and was dangerous. Quietly proceeded to Junction Waterhole [water] - fantastic campsite. 8km, 260m in 5.5 hrs.
Day 4: Up Streak Gorge and down Terraces with side trip to the Prow. Camp at Rover Rockhole [water] - magnificent. 9.5 kms, 490m in 6.5 hrs
Day 5: Past Cleft along Italowie South - up Scree Ck to McKinley Bluff - camp about 1km further along ridge towards McKinley. 11km, 480m in 6 hrs
Day 6: Steep descent off McKinley Bluff on a scree slope from the campsite and through to Pinch Gorge before exit along Italowie to the car. 9.6km in 5 hrs.
{The slow progress was due to extreme grief at my broken camera at Pinch Gorge}
We had 1 hot day along Scree Creek, but the rest of the weather was good with rain on the last day.
Conclusions:
There is a great 3 day trip to be had by doing a loop over Mt McKinley to McKinley Bluff - camping high on 2 nights, but you would need to carry water to last the 3 days. We met a pair heading up McKinley Bluff via Pinch doing just this trip in reverse as we were leaving.
This could easily be extended to 4 days by adding a night at Junction Waterhole - which enables a water pickup. Up to McKinley -> Junction ->Scree to McKinley Bluff and then exit. Either as we did to Pinch - or probably a lot easier - down the longer southerly ridge to Doctor Chewings Creek again. You need to allow time for travel to/from the Gammons. Its an 8 hour trip from Adelaide.
Using Junction as a base - you could also seek to climb Cleft Peak [the South ridge is considered a bit easier] and camp up top.
Check photos on
http://bushwalk.com/forum/viewtopic.php?f=9&t=2526&p=38635&hilit=gammons#p24431Many folk access Bunyip as a day trip from Loch Ness Well. This could be extended to a 3 day trip via John Roberts and Shelf Chasm.
I will PM a bit more detail.
Big provisos - this is very remote country! And there are essentially no tracks! The normal recommendation is a group of 4 for safety, but my first trip was with 2 of us. I would highly recommend a PLB and you need to leave an itinerary with the rangers [if you can find them
- slip it under the door]
Water purification is essential. There were big blue water barrels on Mt McKinley - but we did not use them as we had no idea how long they had been there or who they were for. The rangers should be able to advise.
End of October is high risk on the weather - it could be starting to get very hot. And they may not allow camping out past the end of October.
A shorter walk might be more advisable if there is any hint of real heat.
I also check rain stats. The station on the range has closed, but Arkaroola shows good rain in March, but not a lot since then.